You'd be surprised. The place on FreePageCorporation's license was a Long Lines center converted over from microwave to fiber back then, so there was lots of floor space. Wouldn't be surprised if they just left them there (like they did with everything else). I'd just about bet this company just bought the assets along with the license and brokered a deal to use the site. Aside from the site rental costs, the price would have been right.
I used to work in the Other Mobile Systems group (a/k/a, Obsolete Mobile Systems) that kept this system going until about 1990, until NYNEX Paging Co. (who OMS reported to) was sold to PageAmerica. Despite cellular coverage even back then, NYNEX Mobile kept this system on the air until about 1991 or so. The boss had a Motorola Pulsar boat anchor in his car to use, and his voice was the recorded "New York Mobile." We also did the New York Harbor (plus Upstate - that was my stuff travelling between Plattsburgh, Utica and Newark, NY) maritime stuff and air-to-ground.
At the time, there were probably 8 MSY vintage Motorola IMTS transmitters up there. I don't think they were Micors. If I remember correctly (and I'm a guy who has trouble remembering what he just ate for lunch), the receivers were at the telephone company building on Varrick St. They were all shipped to Sunnyside, Queens, just up the street from the FDNY central repair shop where the switch was. The UHF system had receivers on top of Empire and then transmitters out of Kew Gardens in Queens. There were remnants of the old 35/ 43 MHz MTS system - the receivers were in Staten Island near Todt Hill and transmitters were on Varrick St. That was used until the early 80's and taken down, I think, in 1982 or 3. Word was you could use that system from Philadelphia to just about Boston.
That particular site also had the 146.67 Telephone Pioneers repeater on it. I built that repeater in 1989 out of a Motorola MSF receiver and a Quintron QT-250B VHF transmitter that was surplussed from 152.84. Last time I came back to visit, I couldn't key it. Guess it came down.